A baby has become a viral sensation and might very well be the youngest Internet star ever because he (or she) hasn't even been born yet. The Internet is abuzz over an ultrasound photo of a fetus giving the "thumbs up" sign. The baby, who is due to arrive in January, has already been dubbed "The Fonzie Fetus" after the iconic Happy Days character. The picture was released by the baby's father, Brandon Hopkins, on Reddit.